They behave identically on my system. Bit-for-bit identical outputs, and no speed boost to boot!
I'm using the 9.29KB me-prepass diff from the first post. It's a bit bigger than the one I used before, so I assume it's new.
Started from fresh r680 source and applied (in order) satd, subme7, me-prepass.
Yep.
[edit] Ah, wait, finally at merange 4 I notice a teensy weensy bit of difference (<.1%). Probably compiler differences, though, since I updated GCC.
But anyone who uses merange 4 is truly insane, and for a different reason.